15In France, the monitoring of landfill cover after closure of the site is a local problem, since its 16 tightness must be ensured over time. Leaks in the cover are a problem, as they allow water to 17 infiltrate the stored waste. In order to locate such leaks, electrical resistivity tomography was 18 used on an experimental site in which defects had been intentionally made in the cover.
19Repeated measurements taken on this site showed that the weather conditions preceding the 20 measurements need to be taken into account, as they affect the water content in the cover 21 material. They also showed that there are optimal weather conditions for detecting defects in 22 the cover. A statistical analysis carried out on the electrical resistivity results for all surveys 23 and cover material samples showed that the material was heterogeneous; this variability was 24 mainly due to a difference in particle size (fines content) and in compaction. This study has shown the capacity of electrical resistivity tomography to detect defects and 26 heterogeneity in the cover material, indicating that it is a good means of monitoring the 27 quality of landfill cover both when it is put in place and subsequently.
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